Knowing the geometric conditions of a curved edge hexahedron, the total number of view factor and the number of independent view factor between each surface are
A. 25, 10
B. 25, 15
C. 36, 10
D. 36, 15
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The numeric value of the solar constant is approximately 1370 W/m2, and its physical significance can be described as：
A. The solar radiation energy that is received by a unit area on earth
B. The radiation energy that is emitted from a unit area of the sun
C. The solar radiation energy that is received by a unit area perpendicular to the sun rays at the outer edge of the atmosphere
D. All the above descriptions are incorrect
Gas radiation differs from solid and liquid radiation in that it has several characteristics including:
A. Strong selectivity about the wavelength
B. All gases have radiation capability
C. Occurrence in the whole volume
D. All the above statements are correct
The characteristics that differentiate the radiation heat transfer from the conduction and convection heat transfer include:
A. Strong directionality
B. Occurrence in vacuum
C. Energy transformation and transfer
D. Requirement for temperature difference
The descriptions which are correct for the black bodies include:
Absorptivity is equal to 1
B. Ideal objects which are non-existent in practice
C. The black body has the highest emissive power for a given temperature
D. All the above descriptions are incorrect
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